C0790 - Understanding and Fixing the Code in 2010-2020 Chevrolet Equinox and Other Models

Quick Answer

C0790 means: C0790 indicates a fault with the steering angle sensor's performance.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with C0790? Immediate attention is recommended to ensure safe vehicle operation.

Common Questions

What does C0790 mean and how does it affect my car?

The C0790 code indicates a malfunction in the steering angle sensor, which is crucial for the vehicle's stability control system. If this sensor fails, it can compromise your vehicle's handling, especially during adverse conditions. This could lead to difficulties in steering or increased risk of losing control while driving.

What are the most common causes of C0790 and how much does it cost to fix?

Common causes include a faulty steering angle sensor, damaged wiring, or issues with the vehicle's electronic control unit. Repair costs can range from $50 for wiring repairs to $300 for a full sensor replacement.

Can I drive my car with C0790 or should I stop immediately?

It's advisable to stop driving your vehicle if the C0790 code appears, as it compromises your vehicle's handling and stability. Continuing to drive could lead to dangerous situations, especially in inclement weather or sharp turns.

How can I diagnose C0790 myself using GeekOBD APP?

To diagnose C0790 with the GeekOBD APP, connect the app to your vehicle's OBD2 port, scan for codes, and review freeze frame data. Look for any abnormalities in steering angle readings and check if other related codes are present.

What vehicles are most commonly affected by C0790?

The C0790 code is often seen in models like the 2010-2020 Chevrolet Equinox and GMC Terrain, as well as the Cadillac SRX. It's wise to check for any recalls or technical service bulletins related to these vehicles.

How can I prevent C0790 from happening again?

Regular vehicle maintenance can help prevent C0790. This includes checking the wiring and connections around the steering column during service intervals and ensuring that software updates are applied as recommended by the manufacturer.

What is C0790?

The diagnostic trouble code (DTC) C0790 refers to a malfunction in the vehicle's steering angle sensor. This sensor plays a critical role in providing accurate steering information to the vehicle's stability control systems. When the C0790 code is triggered, it indicates that the steering angle sensor is out of range or not functioning properly, which can lead to compromised vehicle handling and stability. In practical terms, if your vehicle's stability control system cannot determine the correct steering angle, it may not be able to assist in situations where traction control is needed. This can result in poor handling during cornering or slippery conditions, increasing the risk of accidents. Common vehicles that may experience this issue include the 2010-2020 Chevrolet Equinox, GMC Terrain, and Cadillac SRX. Ignoring the C0790 code can lead to further damage to your vehicle’s steering components and potentially costly repairs in the future. Therefore, it is essential to diagnose and resolve this issue as soon as it arises to ensure both your safety and the optimal performance of your vehicle.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0790 is present:

  • The check engine light remains illuminated, indicating a persistent issue that needs attention.
  • The vehicle may experience unusual handling characteristics, such as drifting or difficulty maintaining a straight line, especially at higher speeds.
  • Drivers might notice that the stability control warning light activates frequently, suggesting issues with traction control performance.
  • In some cases, the vehicle may exhibit a loss of power steering assist, making it harder to steer, particularly at lower speeds.
  • Fuel economy may decrease by approximately 5-10% if the vehicle's stability systems are compromised.

Possible Causes

Most common causes of C0790 (ordered by frequency):

  1. The most common cause of the C0790 code is a malfunctioning steering angle sensor, which accounts for about 60% of cases. This may happen due to wear and tear or electrical issues.
  2. Another frequent cause is a faulty connection in the wiring harness associated with the steering angle sensor. This can lead to intermittent failures that trigger the code.
  3. Additionally, issues with the vehicle's electronic control unit (ECU) can cause incorrect readings from the steering angle sensor, leading to the C0790 code.
  4. Less commonly, physical damage to the steering column or sensor itself can result in this code being triggered.
  5. A rare but possible cause includes software glitches in the vehicle's stability control system, which may require a software update to resolve.

C0790 Repair Costs

Cost Breakdown by Repair Type

Steering Angle Sensor Replacement

Replacing the faulty steering angle sensor with an OEM part.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing damaged wiring or connectors related to the steering angle sensor.

  • Total: $50 - $150
  • Success rate: 80%
ECU Software Update

Updating the vehicle's ECU software to fix potential glitches.

  • Total: $100 - $200
  • Success rate: 70%
Money-Saving Tips for C0790
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional C0790 Diagnosis Process

Follow these systematic steps to accurately diagnose C0790. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Examine the vehicle's wiring harness for any visible damage, loose connections, or corrosion that could affect the steering angle sensor (5-10 minutes)

Step 1: Initial visual inspection - Examine the vehicle's wiring harness for any visible damage, loose connections, or corrosion that could affect the steering angle sensor (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all diagnostic codes and freeze frame data to gather context about the fault (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all diagnostic codes and freeze frame data to gather context about the fault (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Employ a multimeter to test the steering angle sensor and ensure it operates within specified voltage ranges (20-30 minutes)

Step 3: Component testing - Employ a multimeter to test the steering angle sensor and ensure it operates within specified voltage ranges (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After any repairs, verify the proper operation of the steering angle sensor and clear the codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - After any repairs, verify the proper operation of the steering angle sensor and clear the codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Conduct a road test under various driving conditions to confirm that the issue has been resolved (15-20 minutes)

Step 5: Road test verification - Conduct a road test under various driving conditions to confirm that the issue has been resolved (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Steering Angle Sensor Replacement in 2016 Chevrolet Equinox

Vehicle: 2016 Chevrolet Equinox, 75,000 miles

Problem: Customer reported the check engine light was on and the vehicle felt unstable during turns.

Diagnosis: OBD2 scan revealed C0790. Visual inspection showed corrosion on the wiring harness near the steering column.

Solution: Replaced the steering angle sensor and repaired the damaged wiring. Cleared the codes and performed a road test.

Cost: $250 (sensor $200, labor $50)

Result: After the repair, the check engine light cleared and the vehicle handled smoothly.

Case Study 2: Wiring Repair in 2018 GMC Terrain

Vehicle: 2018 GMC Terrain, 50,000 miles

Problem: Customer noticed the stability control warning light was frequently illuminated.

Diagnosis: C0790 was present. A thorough inspection revealed frayed wires in the steering column.

Solution: Repaired the wiring connections and ensured all connectors were secure.

Cost: $100 (labor $50, parts $50 for connectors)

Result: The stability warning light was resolved, and the vehicle's handling improved significantly.

Diagnose C0790

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0790
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes